Dire wolves actually existed, living up to 10,000 years ago before going extinct.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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Sharks have been on the planet longer than trees.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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